. Well if it's different, so why compare them all? It would have been better if you asked, Should I be doing conventional or sumo? Also, should I be doing Romanian? Well, I don't want to argue or anything but do whatever you feel is good. For me, sumo is alot easier then conventional. Anyways, your not

supposed

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to do anything. Just ease up on the weight a bit (for romanian), since it is a tiny bit harder on the back (anecdoctal evidence). Are you tall?

summo or conventional should work, it should nto matter, be sure to rotate the two, do bothg, not one or the other.
Squats should be box or normal.
use a BB or DBs, either will work, i dunno the difference in lunges, i never do em, i would say do whatever u feel works the best.